Helmet strap



FIG. 1 is a front perspective view of a helmet strap showing our newdesign;

FIG. 2 is a front view of the helmet strap of FIG. 1;

FIG. 3 a top view of the helmet strap of FIG. 1;

FIG. 4 an enlarged end view of the helmet strap of FIG. 1; and,

FIG. 5 a rear view of the helmet strap of FIG. 1.

CLAIM The ornamental design for a helmet strap, as shown and described.